Hillier, Bill. "Can streets be made safe?." Urban design international 9.1 (2004): 31-45.
Several powerful and simple factors inhibiting crime are identified: join buildings together, avoid any kinds of secondary access (even to a high wall, if it is exposed to the public realm), make sure that all public spaces are continuously ‘constituted’ by 10 dwelling entrances (including the entrances to blocks of flats), and maximise the intervisibility of these entrances by a linear rather than a broken up layout. At the level of the overall layout, reasonably regular streets layouts with fairly large blocks (to structure movement and reduce unnecessary permeability) are best.
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